1.Stop wearing hard contact lenses (such as OK lenses) for more than 2 weeks and soft contact lenses (such as Dr. Len) for more than 1 week before the examination. 2.Avoid excessive eye strain the day before the examination. 3.If you have acute inflammatory diseases of the eyes, you should go to the hospital for examination after treatment and stabilization. Precautions before surgery 1. 1 to 3 days before surgery, take antimicrobial eye drops such as (Colpitol or Tobex, etc.). (1) Start using them 3 days before surgery: 3-4 times a day for 3 days. (2) Use less than 3 days before surgery: 4-6 times a day. 2. One day before surgery, please wash your hair, take a shower, cut your nails, and do your personal hygiene, and do not use perfume or cosmetics on the day of surgery. 3.Please arrange a relative or friend to accompany you to the surgery and send you home after the surgery. 4.If you have a cold or special discomfort before the surgery, please inform the doctor so that we can handle it at our discretion. For women, please avoid undergoing surgery during your menstrual period.